Java 在 Groovy 中解析 JSON 数组
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Parsing array of JSON arrays in Groovy
提问by Tihom
I have the following string from a REST JSON response:
我从 REST JSON 响应中得到以下字符串：
[
{
"uid":10512213,
"name":"Bob"
},
{
"uid":7208201,
"name":"John"
},
{
"uid":10570,
"name":"Jim"
},
{
"uid":1799657,
"name":"Sally"
}
]
The rest response definition is from Facebook: FB REST Link
其余响应定义来自 Facebook：FB REST Link
I am using Google App Engine + GAELYK which runs in Jetty.
我正在使用在 Jetty 中运行的 Google App Engine + GAELYK。
What is the best way to convert the above into arrayof mapsin Groovy on the Server. (This would probably have to recurse through the response)
在服务器上的 Groovy中将上述内容转换为映射数组的最佳方法是什么。（这可能必须通过响应递归）
I am looking for something easy that doesn't include a lot of libraries. (I dont have maven)
我正在寻找一些简单的东西，不包括很多图书馆。（我没有maven）
采纳答案by tim_yates
EDIT: Groovy since 1.8.0 has an integrated JsonSlurper:
编辑：Groovy 从 1.8.0 开始集成了 JsonSlurper：
import groovy.json.JsonSlurper
// Example Response Data
def restResponse = '[{"uid":10512213, "name":"Bob"},{"uid":7208201, "name":"John"},{"uid":10570, "name":"Jim"},{"uid":1799657, "name":"Sally"}]'
// Parse the response
def list = new JsonSlurper().parseText( restResponse )
// Print them out to make sure
list.each { println it }
Old answer below:
下面的旧答案：
Use JsonSlurper...
使用 JsonSlurper...
An example script to read that response would be:
读取该响应的示例脚本是：
@Grab('net.sf.json-lib:json-lib:2.3:jdk15')
import net.sf.json.groovy.JsonSlurper
// Example Response Data
def restResponse = '[{"uid":10512213, "name":"Bob"},{"uid":7208201, "name":"John"},{"uid":10570, "name":"Jim"},{"uid":1799657, "name":"Sally"}]'
// Parse the response
def list = new JsonSlurper().parseText( restResponse )
// Print them out to make sure
list.each { println it }
This outputs:
这输出：
[uid:10512213, name:Bob]
[uid:7208201, name:John]
[uid:10570, name:Jim]
[uid:1799657, name:Sally]
As you can see, listis a list of Maps, so if you just wanted a list of the names for example, you could just do:
正如你所看到的，list是一个地图列表，所以如果你只是想要一个名称列表，你可以这样做：
def names = list.name
To use this in your Gaelyk app, you should just need to download json-lib-2.3-jdk15.jar from hereand do something similar (without the @Grab then, as you'll have the jar in your WEB-INF/libfolder.
要在您的 Gaelyk 应用程序中使用它，您只需要从这里下载 json-lib-2.3-jdk15.jar并执行类似的操作（然后不使用 @Grab，因为您的WEB-INF/lib文件夹中将有 jar 。
--edit--
- 编辑 -
Looking around, found this page showing the dependenciesfor json-lib
- jakarta commons-lang 2.4
- jakarta commons-beanutils 1.7.0
- jakarta commons-collections 3.2
- ssh linuxs
- ezmorph 1.0.6
The @Grab in the test script does a lot of background work for you
测试脚本中的@Grab 为你做了很多后台工作
回答by Buhake Sindi
JSON Arrays starts with a [character and ends with a ]character. JSON object starts with a {and ends with }.
JSON 数组以[字符开头并以字符结尾]。JSON 对象以 a 开头{并以}.
If you go to JSON.org, you can download JSONArray.java. Use that to create a JSON array. You then loop through the array for (int i = 0; i < array.length(); i++)and retrieve each JSON object by calling array.getJSONObject(i);which returns JSONObject. From there, get the respective attribute value, e.g. long uid = json.getLong("uid");
如果你去 JSON.org，你可以下载 JSONArray.java。使用它来创建一个 JSON 数组。然后循环遍历数组for (int i = 0; i < array.length(); i++)并通过调用array.getJSONObject(i);which 返回来检索每个 JSON 对象JSONObject。从那里，获取相应的属性值，例如long uid = json.getLong("uid");
Hope this helps.
希望这可以帮助。
